minor: formatting, whitespace, doc annotations
AerisTile: minor refactor
MockMapObject: fix jasmineToString
AnimationInterface: add isAnimating to interface
Animation/AnimationSync mocks
minor: TileAnimation reorganize
TileAnimation: Improve performance

- wait to load tiles until call stack has cleared
- Use Leaflet reuseTiles option
AnimationInterface: getCurrentTime returns a Date object.

- also, define 'change:time' event
DateHelper: Methods return date helper instance

- Allows for date-manipulation chaining
  eg. new DateHelper().addHours(2).addMinutes(30).getDate() --> 2:30
DateHelper#addTime
DateHelper#setDate return the date helper instance
MockAnimation#getCurrentTime, inherits from Events
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